Electrically exploded opening switches in high-current explosive magnetic generators

Buyko, A.M.

doi:10.1134/s0021894415010186

Cited by 7 publications

(1 citation statement)

References 8 publications

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“…First, we ignore the flow of matter and consider the process of current equalization across the liner width for initially nonuniform currents. This problem is physically interesting for a wide range of systems with thin conductors, in particular, for foil opening switches [16], [17]; it characterizes their stability with respect to filamentation (their stability with respect to stratification was explored in [18]) and offers an approach for describing the distribution of currents in flat foil systems, like "serpentines," which have been explored lately as candidate fast opening switches for powerful current sources [19]. For simplicity (and for possible applications), we suppose that the current distribution depends only on the x-coordinate perpendicular to the current direction.…”

Section: Spreading Of Current Over a Uniform Linermentioning

confidence: 99%

Instability of Thin Resistive Liners in the Linear Approximation

Garanin

Kravets

Dolinskiy

2020

IEEE Trans. Plasma Sci.

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Magnetic implosion of liners is usually accompanied by the development of the Rayleigh-Taylor instability, which makes it hard to achieve high energy densities. However, the liners, which are thin compared with their skin layer (let us call them resistive), can also experience a different kind of instability, when parallel currents in different liner parts are attracted and draw these parts together dividing the liner into layers and filaments (filamentation or the tearing instability). We consider the problem of perturbation development in an infinitely thin resistive liner accounting for the distribution of the magnetic field, spread of currents, and flow of matter assuming that the perturbations are linear. Considering potential applications for different liner configurations (Z-and-pinch liners and flat flyers) and the fact that the most destructive instabilities develop from the shortest wavelengths, we restrict our analysis to a planar case, which ignores the curvature of the liner and magnetic field lines. We find that the instability develops from any perturbation wavelengths, similar to the case of a perfectly conducting liner, with the instability growth rate for all the wavenumbers k being of the order of kg (g is the liner acceleration), but always less than kg, and with the maximum growth rates for any directions of the wave vector k being greater than the growth rates of the perfectly conducting liner. One can often treat wire-array liners as resistive and, hence, use the results obtained for the description of instability development after the phase of merging the plasmas produced by individual wires.

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Section: Spreading Of Current Over a Uniform Linermentioning

confidence: 99%

Instability of Thin Resistive Liners in the Linear Approximation

Garanin

Kravets

Dolinskiy

2020

IEEE Trans. Plasma Sci.

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Simulations of ALT-like explosive magnetic devices for ramp compression of materials by magnetically imploded liners

Buyko

Ivanova

Morozova

2020

Matter and Radiation at Extremes

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Revised simulations of ALT-like devices are presented. The results from these simulations closely match those from experiments and demonstrate the capabilities of the devices as applied to ramp compression of metals to pressures of 20 Mbar by imploding liners driven by ∼10 MG azimuthal magnetic fields (with currents up to 55 MA). These results can be applied to the design of experiments on isentropic compression of materials.

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Study of the structure of exploding flat foils at superhigh current density

Shelkovenko

Pikuz

Tilikin

et al. 2020

Journal of Applied Physics

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We have investigated the features produced in flat metal foils as a result of nanosecond explosions and phase transitions at current densities of (0.1–2) ⋅ 109 A/cm2. Thin foils made of aluminum, copper, nickel, and titanium, with thicknesses of 1–15 μm, were tested. The exploded foil structure was studied using X-pinch radiography and laser shadow imaging. Al, Ti, and Cu (5 and 7 μm thick) foils had an initial two-dimensional structure. At the same time, no apparent structure was registered in 1 μm Cu and 5 μm Ni foils. Experiments on generators with different output parameters have shown that the dominant structures that developed in the explosion are either cracks or bubbles and may depend on the orientation of the initial structure in the thin foil with respect to the current direction. In addition, the energy deposited in the foil differs by a factor of about 1.5 for the orthogonal vs parallel current and initial foil structure directions.

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Electrically exploded opening switches in high-current explosive magnetic generators

Cited by 7 publications

References 8 publications

Instability of Thin Resistive Liners in the Linear Approximation

Instability of Thin Resistive Liners in the Linear Approximation

Simulations of ALT-like explosive magnetic devices for ramp compression of materials by magnetically imploded liners

Study of the structure of exploding flat foils at superhigh current density

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